$-3-5+2-11-7+4$
$\lim_{x\to0}\left(\frac{1-\sec x}{x^2\left(\sec x\:\right)}\right)$
$\left(\sqrt{x-2}\right)\cdot\left(\sqrt{x-10}\right)$
$20x^4-72x^2+36$
$739\cdot46$
$\left(4c^3-7e^5\right)^2$
$\lim_{x\to-3}\left(\frac{6x^3+18x^2}{x+3}\right)$
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